Molarity & dilution worksheet with answers

Free printable Molarity & dilution worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
22 g CuSO4​V = 200 mL

22 g of CuSO4 (M = 159.61 g/mol) is dissolved in water to make 200 mL of solution. Find the molarity c.

m = 22 gM = 159.61 g/molV = 200 mL
c = mol/L
2.Easy
26.5 g KClV = 200 mL

26.5 g of KCl (M = 74.55 g/mol) is dissolved in water to make 200 mL of solution. Find the molarity c.

m = 26.5 gM = 74.55 g/molV = 200 mL
c = mol/L
3.Medium
2 mol/LV1​ = ?0.05 mol/L500 mL

You need 500 mL of 0.05 mol/L solution and have a 2 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 2 mol/Lc2 = 0.05 mol/LV2 = 500 mL
V1 = mL
4.Medium
2.5 mol/LV1​0.05 mol/L200 mL

You need 200 mL of 0.05 mol/L solution and have a 2.5 mol/L stock solution. How much water Vwater do you add to the stock solution?

c1 = 2.5 mol/Lc2 = 0.05 mol/LV2 = 200 mL
Vwater = mL
5.Hard
0.4 mol/L100 mL3 mol/L400 mLc = ?500 mL

100 mL of a 0.4 mol/L solution is mixed with 400 mL of a 3 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.4 mol/LV1 = 100 mLc2 = 3 mol/LV2 = 400 mL
c = mol/L
6.Hard
1.5 mol/L100 mL0.05 mol/L250 mLc = ?350 mL

100 mL of a 1.5 mol/L solution is mixed with 250 mL of a 0.05 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 1.5 mol/LV1 = 100 mLc2 = 0.05 mol/LV2 = 250 mL
c = mol/L

Answer key

  1. 1. c = 0.6892 mol/L
  2. 2. c = 1.777 mol/L
  3. 3. V1 = 12.5 mL
  4. 4. Vwater = 196 mL
  5. 5. c = 2.48 mol/L
  6. 6. c = 0.4643 mol/L

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